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June 1981

Erythromycin-Resistant Group A Streptococci-Reply

Author Affiliations

Department of Pediatrics Naval Aerospace and Regional Medical Center Pensacola, FL 32512

Am J Dis Child. 1981;135(6):578. doi:10.1001/archpedi.1981.02130300076030

In Reply.—The results obtained by Dr Garber demonstrate very well how microorganisms of a single species are not static, but vary in their properties from place to place and from time to time. His bacteriological studies were performed by a technique identical to ours and in conformity with the accepted Kirby-Bauer method.1 Our laboratory consistently found a zero zone of inhibition to erythromycin on disk-susceptibility testing, with daily quality control to ensure disk antimicrobial potency. Because of expressed interest in the question of resistance to antibiotics, we are planning a follow-up study of streptococcal susceptibility to seek corroboration of our findings.

Certainly the susceptibilities of group A β-hemolytic streptococci to antibiotics should be monitored. Because the justification for treatment in the individual patient is the prevention of rheumatic fever, we believe that follow-up cultures of throat material should be made when the patient has been treated with an

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